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GRE写作范文——Oil Refining.

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  An important new industry, oil rining, grew after the Civil war. Crude oil, or petroleum - a dark, thick ooze from the earth - had been known for hundreds of years, but little use had ever been made of it. In the 1850’s Samuel M. Kier, a manufacturer in western Pennsylvania, began collecting the oil from local seepages and rining it into kerosene. Rining, like smelting, is a process of removing impurities from a raw material.

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